>Magister Scientiae - MSc / The new 64-dish radio telescope array MeerKAT will be absorbed into the international
Square Kilometre Array (SKA) in late 2020s. These two telescope arrays will
produce three-dimensional maps of the integrated intensity of the 21cm emission
from neutral hydrogen in galaxies, out to redshifts of 1:5 and 3 respectively. These
maps contain a signature of the growth of large-scale structure in the Universe.
This signature can be uncovered via redshift space distortions of the two-point
correlation function, or power spectrum, of the 21cm brightness temperature
uctuations.
The growth rate governs the amplitude of the anisotropic signal from
redshift-space distortions. It is a powerful probe of gravity and its measurement
has the potential to test whether general relativity holds. We use models of the
21cm intensity and its power spectrum, starting from a simple linear model of
redshift-space distortions and then extending to nonlinear models. With these
models, we make Fisher forecast predictions of the precision with which MeerKAT
and the SKA can measure the growth rate
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uwc/oai:etd.uwc.ac.za:11394/7903 |
| Date | January 2020 |
| Creators | Kopana, Mponeng |
| Contributors | Maartens, Roy |
| Publisher | University of the Western Cape |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Rights | University of the Western Cape |
Page generated in 0.0019 seconds